1001111220988 has 24 divisors (see below), whose sum is σ = 1759049460000. Its totient is φ = 498526915008.

The previous prime is 1001111220983. The next prime is 1001111221007. The reversal of 1001111220988 is 8890221111001.

It is a super-2 number, since 2×1001111220988² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001111220983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3071806 + ... + 3382042.

It is an arithmetic number, because the mean of its divisors is an integer number (73293727500).

Almost surely, 2^{1001111220988} is an apocalyptic number.

It is an amenable number.

1001111220988 is a deficient number, since it is larger than the sum of its proper divisors (757938239012).

1001111220988 is a wasteful number, since it uses less digits than its factorization.

1001111220988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313509 (or 313507 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 34.

Adding to 1001111220988 its reverse (8890221111001), we get a palindrome (9891332331989).

The spelling of 1001111220988 in words is "one trillion, one billion, one hundred eleven million, two hundred twenty thousand, nine hundred eighty-eight".